*He nods back casually, but the faint tightening of his mouth speaks volumes: he doesn't like Rose being in here alone with Sirius. But for all that he doesn't trust her, he does trust him, and heads for the study with the cherries in hand. He speaks without looking over his shoulder, as though he can't be bothered with it.*

I'll be back here, then.

*Once there, of course, he silently moves a chair to near the study door and listens carefully to what's going on in the living room, a book in hand just in case he's caught at it.*